Re: DIY IR receiver - finding parts & advice.

["Nick Towers <nickt@xxxxxxx>" <nickt@xxxxxxx>]

Coincidently I've (in the last week) breadboarded together the IR 
extender circuit described in 
=
http://www.mitedu.freeserve.co.uk/Circuits/Interface/irext.htm 
and I was pleasantly surprised with results ie it worked! Only issue 
is that I need an IR photodiode with a daylight filter (otherwise it 
is too sensitive to visible light)  so assuming the part arrives I'll
=
swap it and see what happens.
Now this circuit is very simple - all it is really is an amplifier.
The down side is that the photodiode needs to be within a metre of 
the remote control unit (handset), but the output worked across my 
CAT5 network and has good range from the IR LED on the output (well 
4metres at least). As its just an amplifier, nothing needs adjusting 
so no "tuning" to 38kHz etc. Component cost c =A32.50.
I've also got the bits to build Nigel Orr's circuit to make a 
comparison. I expect this to be less prone to noise and accept a 
longer range on the input. My worry is that (if I understand the 
circuit correctly) the signal is detected, demodulated, then 
remodulated - and I wonder what really happens to the signal in 
practice ie whether its prone to self induced positive feedback. Any 
way we'll see.
Would like to hear what conclusions you draw from your project though.
Regds
Nick


--- In ukha_d@xxxxxxx, ian.bird@c... wrote:
> 
> Thanks. Interesting though..... It will be fun playing with these 
on a
> scope to see what the pulse is like. Interesting to see the 
receiver as
> well.
> 
> Thanks
> 
> Ian
> 
> 
> 
> 
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> 
> 
> Just for info:
> 
> The Xantech sytem sends modulated signal between the units.  All
=
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> smarts are in the receiver.  The simplest distributon blocks
(whi=
ch
> come with most receivers)just have current limit resistors for the
> emitters.
> 
> David.

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